Acetic Anhydride → Propylene Glycol Diacetate

HRID 1656791Notes

Reaction equation

HRID 1656791 reaction equation
[C:1]([O:4][C:5](=O)[CH3:6])(=[O:3])[CH3:2]>[Cl-].[Zn+2].[Cl-]>[C:1]([O:4][CH2:5][CH:5]([O:4][C:1](=[O:3])[CH3:2])[CH3:6])(=[O:3])[CH3:2]

Participants

3

Reactant 1

HCID 7918Acetic Anhydride

Product 1

HCID 12198Propylene Glycol DiacetateYield 80%

Reagents, catalysts & solvents 1

HCID 3007855ZincchlorideCatalyst

Conditions

Temperature
140 °C

Procedure

A 1-liter flask is charged with 3000 mol. wt. polyether triol (200 g, PO/EO copolymer having about 15 wt. % internal oxyethylene content; a flex-slab polyol), acetic anhydride (500 g), and zinc chloride (35 g). The mixture is heated to 140° C. for 7 h. Propylene glycol diacetate is isolated by distillation in 80% yield.

Workup

  1. additionA 1-liter flask is charged with 3000 mol

Sources & evidence

ORD record
ord-7456438fd0884970ae07779cab1e083b
Source dataset
uspto-grants-1993_10
Patent number
US05254723

Reaction notes

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